add WarpX hot-loop kernels #11
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…ather, Esirkepov deposition) Faithful NumPy ports of the three top CPU-time kernels of a WarpX electromagnetic PIC step, added as n_body_methods micro-apps. Geometry-complete (all WARPX_DIM_* branches as runtime dispatch), all shape orders, Galerkin/staggering, RZ modes, reduced-shape/EB and ionization paths.
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Boris push, field gather, Esirkepov deposition
NumPy ports of the three top CPU-time kernels of a WarpX electromagnetic PIC step, added as n_body_methods micro-apps.